/*
 *  ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
 *  m_list.c: List channel given or all channels.
 *
 *  Copyright (C) 2002 by the past and present ircd coders, and others.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 *  USA
 *
 *  $Id: m_list.c 147 2005-12-26 02:52:10Z jon $
 */

#include "stdinc.h"
#include "tools.h"
#include "handlers.h"
#include "channel.h"
#include "channel_mode.h"
#include "client.h"
#include "hash.h"
#include "irc_string.h"
#include "ircd.h"
#include "numeric.h"
#include "s_conf.h"
#include "s_serv.h"
#include "send.h"
#include "list.h"
#include "msg.h"
#include "parse.h"
#include "modules.h"
#include "s_user.h"

static void m_list(struct Client *, struct Client *, int, char **);
static void ms_list(struct Client *, struct Client *, int, char **);
static void mo_list(struct Client *, struct Client *, int, char **);

struct Message list_msgtab = {
	"LIST", 0, 0, 0, 0, MFLG_SLOW, 0,
	{m_unregistered, m_list, ms_list, m_ignore, mo_list, m_ignore}
};

#ifndef STATIC_MODULES
void
_modinit(void)
{
	mod_add_cmd(&list_msgtab);
	add_isupport("ELIST", "CMNTU", -1);
	add_isupport("SAFELIST", NULL, -1);
}

void
_moddeinit(void)
{
	mod_del_cmd(&list_msgtab);
	delete_isupport("ELIST");
	delete_isupport("SAFELIST");
}

const char *_version = "$Revision: 147 $";
#endif

static int
has_wildcards(const char *s)
{
	char c;

	while((c = *s++))
		if(IsMWildChar(c))
			return 1;

	return 0;
}

static void
do_list(struct Client *source_p, int parc, char *parv[])
{
	struct ListTask *lt;
	int no_masked_channels;

	if(MyConnect(source_p))
	{
		if(source_p->localClient->list_task != NULL)
		{
			free_list_task(source_p->localClient->list_task, source_p);
			sendto_one(source_p, form_str(RPL_LISTEND), me.name, source_p->name);
			return;
		}
	}

	lt = (struct ListTask *) MyMalloc(sizeof(struct ListTask));
	lt->users_max = UINT_MAX;
	lt->created_max = UINT_MAX;
	lt->topicts_max = UINT_MAX;
	if(MyConnect(source_p))
		source_p->localClient->list_task = lt;
	no_masked_channels = 1;

	if(parc > 1)
	{
		char *opt, *save;
		dlink_list *list;
		int i, errors = 0;

		for(opt = strtoken(&save, parv[1], ","); opt != NULL;
		    opt = strtoken(&save, NULL, ","))
			switch (*opt)
			{
			case '<':
				if((i = atoi(opt + 1)) > 0)
					lt->users_max = (unsigned int) i - 1;
				else
					errors = 1;
				break;
			case '>':
				if((i = atoi(opt + 1)) >= 0)
					lt->users_min = (unsigned int) i + 1;
				else
					errors = 1;
				break;
			case '-':
				break;
			case 'C':
			case 'c':
				switch (*++opt)
				{
				case '<':
					if((i = atoi(opt + 1)) >= 0)
						lt->created_max = (unsigned int) (CurrentTime
										  - 60 * i);
					else
						errors = 1;
					break;
				case '>':
					if((i = atoi(opt + 1)) >= 0)
						lt->created_min = (unsigned int) (CurrentTime
										  - 60 * i);
					else
						errors = 1;
					break;
				default:
					errors = 1;
				}
				break;
			case 'T':
			case 't':
				switch (*++opt)
				{
				case '<':
					if((i = atoi(opt + 1)) >= 0)
						lt->topicts_min = (unsigned int) (CurrentTime
										  - 60 * i);
					else
						errors = 1;
					break;
				case '>':
					if((i = atoi(opt + 1)) >= 0)
						lt->topicts_max = (unsigned int) (CurrentTime
										  - 60 * i);
					else
						errors = 1;
					break;
				default:
					errors = 1;
				}
				break;
			default:
				if(*opt == '!')
				{
					list = &lt->hide_mask;
					opt++;
				}
				else
					list = &lt->show_mask;

				if(has_wildcards(opt + !!IsChanPrefix(*opt)))
				{
					if(list == &lt->show_mask)
						no_masked_channels = 0;
				}
				else if(!IsChanPrefix(*opt))
					errors = 1;
				if(!errors)
				{
					char *s;
					DupString(s, opt);
					dlinkAdd(s, make_dlink_node(), list);
				}
			}
		if(errors)
		{
			free_list_task(lt, source_p);
			sendto_one(source_p, form_str(ERR_LISTSYNTAX),
				   MyConnect(source_p) ? me.name : ID(&me),
				   MyConnect(source_p) ? source_p->name : ID(source_p));
			return;
		}
	}


	if(MyConnect(source_p))
		dlinkAdd(source_p, make_dlink_node(), &listing_client_list);
	sendto_one(source_p, form_str(RPL_LISTSTART),
		   MyConnect(source_p) ? me.name : ID(&me),
		   MyConnect(source_p) ? source_p->name : ID(source_p));
	safe_list_channels(source_p, lt, no_masked_channels &&
			   lt->show_mask.head != NULL, !MyConnect(source_p));
}

/*
** m_list
**      parv[0] = sender prefix
**      parv[1] = channel
*/
static void
m_list(struct Client *client_p, struct Client *source_p, int parc, char *parv[])
{
	static time_t last_used = 0;

	/* If not a LazyLink connection, see if its still paced */
	/* If we're forwarding this to uplinks.. it should be paced due to the
	 * traffic involved in /list.. -- fl_ */
	if(((last_used + ConfigFileEntry.pace_wait) > CurrentTime))
	{
		sendto_one(source_p, form_str(RPL_LOAD2HI), me.name, parv[0]);
		return;
	}
	else
		last_used = CurrentTime;

	/* If its a LazyLinks connection, let uplink handle the list */
	if(uplink && IsCapable(uplink, CAP_LL))
	{
		if(parc < 2)
			sendto_one(uplink, ":%s LIST", source_p->name);
		else
			sendto_one(uplink, ":%s LIST %s", source_p->name, parv[1]);
		return;
	}

	do_list(source_p, parc, parv);
}

/*
** mo_list
**      parv[0] = sender prefix
**      parv[1] = channel
*/
static void
mo_list(struct Client *client_p, struct Client *source_p, int parc, char *parv[])
{
	/* If its a LazyLinks connection, let uplink handle the list
	 * even for opers!
	 */

	if(uplink && IsCapable(uplink, CAP_LL))
	{
		if(parc < 2)
			sendto_one(uplink, ":%s LIST", source_p->name);
		else
			sendto_one(uplink, ":%s LIST %s", source_p->name, parv[1]);
		return;
	}

	do_list(source_p, parc, parv);
}

/*
** ms_list
**      parv[0] = sender prefix
**      parv[1] = channel
*/
static void
ms_list(struct Client *client_p, struct Client *source_p, int parc, char *parv[])
{
	/* Only allow remote list if LazyLink request */
	if(ServerInfo.hub)
	{
		if(!IsCapable(client_p->from, CAP_LL) && !MyConnect(source_p))
			return;

		do_list(source_p, parc, parv);
	}
}
